99511391 ÷ 277 
Our goal is to divide 99511391 by 277.

Step 1:
If we divide 9 by 277, we get 0 and a remainder of 9.
The next digit of our result is 0. 
Result so far: 0.0
Subtract 0 from 9 to get 9.
Include the next digit (9) from the dividend after 9, then repeat: 99 / 277

Advancing to step 2:
If we divide 99 by 277, we get 0 and a remainder of 99.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 99 leaves us with 99.
Append the next digit (5) from the dividend to 99 and continue with: 995 / 277

Step 3:
995 divided by 277 is 3 with a remainder of 164.
Record the quotient 3 as the next digit in the result. 
Result so far: 3.0
The remainder is 164 after subtracting 831 from 995.
Append the next digit (1) from the dividend to 164 and continue with: 1641 / 277

On to step 4:
1641 divided by 277 is 5 with a remainder of 256.
Put 5 as the next digit of the answer. 
Result so far: 35.0
Subtracting 1385 from 1641 leaves us with 256.
Take the next digit (1) from the dividend and append it to 256, then repeat: 2561 / 277

Moving on to step 5:
The number 277 fits into 2561 9 times, leaving a remainder of 68.
The number 9 becomes the next digit in our result. 
Result so far: 359.0
If we subtract 2493 from 2561, we get 68.
Take the next digit (3) from the dividend and append it to 68, then repeat: 683 / 277

Moving on to step 6:
If we divide 683 by 277, we get 2 and a remainder of 129.
Write down 2 as next digit of the result. 
Result so far: 3592.0
If we take 554 away from 683, we end up with 129.
Include the next digit (9) from the dividend after 129, then repeat: 1299 / 277

Moving on to step 7:
1299 divided by 277 is 4 with a remainder of 191.
Use 4 as the next digit of our solution. 
Result so far: 35924.0
If we subtract 1108 from 1299, we get 191.
Take the next digit (1) from the dividend and append it to 191, then repeat: 1911 / 277

Let's proceed to step 8:
The number 277 fits into 1911 6 times, leaving a remainder of 249.
The next digit of our result is 6. 
Result so far: 359246.0
Subtract 1662 from 1911 to get 249.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2490, and continue the process.

On to step 9:
If we divide 2490 by 277, we get 8 and a remainder of 274.
Record the quotient 8 as the next digit in the result. 
Result so far: 359246.8
If we subtract 2216 from 2490, we get 274.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2740, and continue the process.

Let's proceed to step 10:
2740 divided by 277 is 9 with a remainder of 247.
Record the quotient 9 as the next digit in the result. 
Result so far: 359246.89
If we subtract 2493 from 2740, we get 247.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2470, and continue the process.

Let's proceed to step 11:
If we divide 2470 by 277, we get 8 and a remainder of 254.
Record the quotient 8 as the next digit in the result. 
Result so far: 359246.898
Subtract 2216 from 2470 to get 254.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2540, and continue the process.

Advancing to step 12:
When dividing 2540 by 277, we get 9 with a remainder of 47.
Record the quotient 9 as the next digit in the result. 
Result so far: 359246.8989
If we subtract 2493 from 2540, we get 47.
Since there are no more digits in the dividend, we add a zero to the remainder making it 470, and continue the process.

Advancing to step 13:
470 divided by 277 is 1 with a remainder of 193.
The next digit of our result is 1. 
Result so far: 359246.89891
Subtracting 277 from 470 leaves us with 193.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1930, and continue the process.

Advancing to step 14:
When dividing 1930 by 277, we get 6 with a remainder of 268.
Record the quotient 6 as the next digit in the result. 
Result so far: 359246.898916
Subtracting 1662 from 1930 leaves us with 268.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2680, and continue the process.

Advancing to step 15:
277 goes into 2680 9 times with a remainder of 187.
Use 9 as the next digit of our solution. 
Result so far: 359246.8989169
Deduct 2493 from 2680 and we're left with 187.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1870, and continue the process.

Advancing to step 16:
277 can be fit into 1870 6 times, resulting in a remainder of 208.
Record the quotient 6 as the next digit in the result. 
Result so far: 359246.89891696
The remainder is 208 after subtracting 1662 from 1870.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2080, and continue the process.

The final outcome is 359246.89891696, with a leftover of 2.08e-07.